Rail-to-rail input stages with constant g.sub.m and constant common-mode output currents
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United States of America Patent
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Mar 31, 1998
Grant Date -
N/A
app pub date -
Mar 29, 1996
filing date -
Mar 29, 1996
priority date (Note) -
Expired
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Abstract
A rail-to-rail input stage with constant g.sub.m and constant common-mode output currents is provided. The common-mode output currents are controlled by the use of current switches. When low and high common-mode input voltages are applied to the input stage, the current switches take part of the tail currents of the input stage transistors, divides it into two equal parts, and directs the two equal current signals to the outputs. When intermediate common-mode input voltages are applied, the current switches regulate the tail currents of the input pairs such that the common-mode output current and g.sub.m remains constant. The current switches are responsive to changes in the common-mode input voltages, and thereby maintain the g.sub.m constant.
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